Together AI's Hassan El Mghari (Nutlope) has released Hallmark, an open-source design skill that pushes AI coding agents away from generic-looking UIs. It installs into Claude Code, Cursor, or Codex and is offered free under the MIT license.
Together AI · Open Source · MIT License
Hallmark: killing the "AI slop" look in generated UIs
A free design skill that drops into Claude Code, Cursor, or Codex and steers coding agents away from purple gradients, centered layouts, and default Inter — toward real design principles.
3.6k
GitHub stars, actively updated
20+1
Themes plus a Custom mode for structural diversity
1
Command to install: npx skills add
Slop-test gates run on every build
Each generated UI is checked against a large catalog of anti-patterns, then self-critiqued.
Enforces OKLCH palettes , asymmetric layouts, font pairing, and restrained motion — rejecting template defaults.
Four modes, one skill
Build
Generate a new UI from a prompt and run the slop-test (default)
Audit
Score existing code and output a punch list — no edits made
Redesign
Rework structure while keeping content and branding
Study
Extract design DNA from a screenshot or URL into design.md
Developers like it
Keeps UIs from looking templated
Bakes design sensibility in from the start
Great for first-draft landing pages and site improvement lists
But use with care
Not magic — a way to align judgment
Best on narrow scopes, with human review assumed
Conflicts with existing design systems and rework risk remain
A lightweight skill layer on existing agents — not a replacement tool. Built for internal demos at Together AI before being open-sourced. The more design you delegate, the more direction you must set in advance.
Continue reading The rest of this article is for AI News Blitz readers. Choose an option below to keep reading.
Already purchased? Sign in ✓ Signed in — this article isn’t included in your current plan.Unlocking the full article…